For example, the version of JDK, the version of log4j, the operating system, the running DNS resolver services, the log4j configuration file, the Java configuration file, the environment variables, as well as what other libraries are being included in the application can all make the exploitation and patching of this issue slightly different.Īnd because of this, it is important to make sure that all the software matches the one of the target application. Because of this, we decided to showcase how one would go about building a local lab that could be used both for developing and testing an exploit, as well as help to confirm and adapt remedial actions.įor background, whenever we refer to the Apache log4j vulnerability, we mean the following CVEs:ĭue to the many conditions and elements included in this vulnerability, which significantly influence the impact and the possible steps for remediation, we found that to be able to test and obtain realistic results that can then confidently be relied on, we had to be very precise when setting up the environment. ![]() With its widespread adoption rate and the challenge enterprises face with tracking down where it is being used, log4j would likely continue to be a relevant attack vector for quite a long time. ![]() Home » Technical Research » Building a Research Environment for Log4j
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